Alister Grierson's Sanctum could have been a downright disaster, if the co-producer James Cameron hadn't come in to save the day with his 3D photography techniques. Indeed, the film's breath-taking imagery is the one and only appeal that could possibly lure moviegoers to bear this ninety-minute exercise in tedium.
A group of explorers are trapped by a fierce storm while they're exploring an underground cave system. Water flooding into the cave causes a portion of it to collapse and blocks their exit. The only way out is to venture down into the unexplored part of the cave, and follow a river that supposedly leads to the sea. But unfortunately not all of them are strong enough to survive the suffocating pressure, and the unforeseen dangers that lurk ahead.
The Creator of Titanic and Avatar James Cameron's 3D presentation of the underwater cave system is the most spectacular element. At some points, the effect appears so real that engrossed viewers would literally reach out for an oxygen mask. Even so, there are still noticeable imperfections: all of the underwater sequences reportedly take place in a large water tank at a studio. So whenever the water becomes crystal clear, you'll know something is amiss as long as you are not so lost in the overwhelming scenery.
Despite the claim that the film is based on a true story, there isn't much originality to the storyline. In fact it is such a stereotype that you could almost tell how many scenes are left by counting the characters alive. For the most part, when there aren't any 3D scenes to appreciate, viewers just sit there and watch the director kill off the characters one by one, as any viewers of survival movie would expect.
Bad writing also creates a difficult situation for the actors. Notably, the story for Sanctum is said to come from Andrew Wright, a real life cave-diver who was once trapped in the same situation. But luckily for Andrew, because his team of 15 was sensible enough to cooperate with each other for survival, and survive they all did. So, naturally, a comparison of the real story to Sanctum undercuts the credibility of all mediocre survival movies, like this one, where actors are bound by the script to act like living embodiment of irrationality, if not insanity. For example, Ioan Gruffudd, whose performance is at least presentable elsewhere, plays his part as a ridiculous nuisance to a point beyond all awkwardness.
Then what can be done to redeem a movie ruined by a flat and stereotypical story and bad characterization? You bring out the big shots! So here comes James Cameron with his 3D heavy artillery to save the day.
So, Sanctum deserves a FIVE, simply for the spectacular visuals.